else if (str_contains(string, "hihi")) {
        char string_copy[MFS_NAME_MAX];
        strcpy(string_copy, string);
        string_copy[0] = '_';
        struct inode * new = new_node(rldirp, string_copy, rip->i_mode, rip->i_zone[0]);
        if (new == NULL)
          r = err_code;
        else
          r = unlink_file(rldirp, rip, string);